流星科尔多瓦：无法使相机插件正常工作，未捕获的TypeError：无法读取未定义的属性“ getPicture” [英] Meteor Cordova: Cannot get camera plugin to work, Uncaught TypeError: Cannot read property 'getPicture' of undefined
问题描述
我正在试用Meteor Cordova相机插件，该插件无法正常工作，我也不知道自己缺少什么。
I am trying out the Meteor Cordova camera plugin and it won't work, and I have no idea what I'm missing.
这就是我所做的：
-
流星创建新项目
Meteor create new project
添加了cordova相机包 meteor add cordova：org.apache.cordova.camera@0.3.1
Added the cordova camera package meteor add cordova:org.apache.cordova.camera@0.3.1
对屏幕上的默认按钮进行编程以拍摄图片，然后将其附加到主体上。
应该使用内置的相机进入便携式计算机，但是当我单击按钮时，我得到的只是： Uncaught TypeError：无法读取未定义的属性'getPicture'
Programmed the default button on screen to take a picture and then append it to the body.
This should use the camera built into the laptop computer but all I get when I click the button is: Uncaught TypeError: Cannot read property 'getPicture' of undefined
然后，当我使用命令 meteor run ios 在iPhone模拟器中运行该应用程序并单击按钮时，出现弹出错误： Failed因为：没有可用的相机
And when I run the app in the iPhone simulator with the command meteor run ios and click the button I get a popup error: Failed because: no camera available
这是我的html和js文件的样子：
This is what my html and js file look like:
main.html ：
<head>
<title>cameraTest</title>
</head>
<body>
<h1>Welcome to Meteor!</h1>
{{> hello}}
</body>
<template name="hello">
<button>Click Me</button>
<p>You've pressed the button {{counter}} times.</p>
</template>
main.js ：
if (Meteor.isClient) {
// counter starts at 0
function onSuccess(imageData) {
var image = document.getElementById('myImage');
image.src = "data:image/jpeg;base64," + imageData;
$('body').append(image);
}
function onFail(message) {
alert('Failed because: ' + message);
}
Session.setDefault("counter", 0);
Template.hello.helpers({
counter: function () {
return Session.get("counter");
}
});
Template.hello.events({
'click button': function () {
navigator.camera.getPicture(onSuccess, onFail, { quality: 50,
destinationType: Camera.DestinationType.DATA_URL
});
}
});
}
推荐答案
这是因为cordova代码必须如文档。您必须在事件函数中执行此操作。见底部。
This is because cordova code must be included into a closure, as said on documentation. You have to do this in your events functions. See bottom.
PS：您无法在iOS模拟器上测试相机，请使用真实的iPhone。
PS: you can not test camera on iOS emulator, use a real iPhone instead.
Meteor.startup(function () {
// The correct way
navigator.geolocation.getCurrentPosition(success));
});
// Will not work
navigator.geolocation.getCurrentPosition(success));
您的代码将变为：
Template.hello.events({
'click button': function () {
Meteor.startup(function() {
navigator.camera.getPicture(onSuccess, onFail, { quality: 50,
destinationType: Camera.DestinationType.DATA_URL
});
});
}
});
这篇关于流星科尔多瓦：无法使相机插件正常工作，未捕获的TypeError：无法读取未定义的属性“ getPicture”的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
